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The name Irminones or Hermiones comes from Tacitus's Germania (98 AD), where he categorized them as one of the tribes of descended from Mannus, and noted that they lived in the interior of Germany. Other Germanic groups of tribes were the Ingvaeones, living on the coast, and Istvaeones, who accounted for the rest.[4] Tacitus also mentioned the Suebi as a large grouping who included the Semnones, the Quadi and the Marcomanni, but he did not say precisely which (if any) of the three nations they belong to.

The term Suebi is usually applied to all the groups that moved into this area, though later in history (c. 200 AD) the term Alamanni (meaning "all-men") became more commonly applied to the group.

Jǫrmun, the Viking Age Norse form of the name Irmin, can be found in a number of places in the Poetic Edda as a by-name for Odin. Some aspects of the Irminones' culture and beliefs may be inferred from their relationships with the Roman Empire, from Widukind's confusion over whether Irmin was comparable to Mars or Hermes, and from Snorri Sturluson's allusions, at the beginning of the Prose Edda, to Odin's cult having appeared first in Germany, and then having spread up into the Ingvaeonic North.